JPS5819064Y2 - Front wheel steering structure of agricultural tractors - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a steering structure for the front wheels of an agricultural tractor, and in particular, it is possible to properly support the front wheels of an agricultural tractor and to ensure reliable steering, and based on the state configuration. To provide a compact structure capable of transmitting power to the front wheels with good function and without strain.

Next, the embodiment shown in the drawings will be described.

Figure 1 shows a front view of an agricultural tractor, where 1゜1 is the front wheel, 2 and 2 are the rear wheels, 3 is the handle, 4 is the front-back center bin at the lower front of the machine, and 5 is rotatable on the center pin 4. The differential case 6, 6 supported by the differential case 5 is a front axle case extending on both sides of the differential case 5.

An upper case 7 is provided at the outer end of the front axle case 6.
An oil seal 9 is rotatably provided below the upper case 1 with the upper part of the lower case 8 facing inward, and is fitted into a bearing 10 at the upper part of the upper case I. Insert the kink bottle 11 vertically from inside the upper case T into the lower case 8 and insert the lower end into the lower case 8.
The base of the knuckle arm 12 connected to the pull rond from the handle 3 side is fixed to the upper end of the king pin 11 that protrudes above the upper case 7 by welding W to the lower part of the upper case 7. A tie rod 13 is connected between them.

The boss body A of the bevel gear a is rotatably fitted to the kink bin 11 between the bearing 10 in the upper case T and the earthen wall part 8' of the lower case 8. and are fitted so as to face the direction of the earth wall part 8', and rings 14, 14 and bushing metal 15 are interposed between the upper and lower ends of the boss body A and the king pin 11 at the middle part, A spline 16 is formed on the outer periphery of the boss body A, and the boss body B having a bevel gear b on one end is aligned with the outer periphery of the boss body A, and the female spline 1T of the boss body B is engaged with the spline 16 and fitted. A snap ring 18 is engaged between one end side of the boss body H and one end side of the boss body A, and the bevel gear b is formed to face opposite to the bevel gear a. A bearing C is fitted into the stepped portion 19 formed on the outer periphery of the bevel gear a, and the bearing C is fitted into the inner peripheral portion 20 inside the lower part of the upper case 1, and the lower end of the bevel gear a and the lower case 8
A thrust bearing body H is interposed between the earth wall portion 8' and the upper surface of the earth wall portion 8'.

A transmission shaft is provided in the differential case 5 to input and operate the differential device, and a drive shaft 21 extends in both front axle cases 6.6, and a drive shaft 21 protrudes into the upper case T. A bevel gear 22 is fixedly installed at the end of the bevel gear b, and the bevel gear 22 is meshed with the bevel gear b.

Further, an axle 24 supported by a bearing 23° 23 is provided on the side of the lower case 8, and a bevel gear 25 fixed to the inner end of the axle 24 meshes with the bevel gear a.
A flange 26 is fixed to the outer end of the flange 26.
The disc portion 1 of the front wheel 1 is removably attached to the front wheel 1 by means of a bolt 21.

In short, the agricultural tractor with the above configuration is a four-wheel drive type, and the rotation of the drive shaft 21 is transmitted to the axle 24 via the bevel gear 22, bevel gear b, boss body B, A1 bevel gear a, and bevel gear 25, and 1,1 drive is performed,
By steering the handle 3, the lower case 8 rotates with the rotation of the nuncle arm 12, and the lower case 8 steers the front wheel 1 while rotating around the kink bin 11, and the other front wheel 1 is also interlocked with the tie rod 13. is steered in the same direction.

In the above structure, the weight of the aircraft is applied from the upper case γ side to the lower case 8 side supported by the front wheel 1 touching the ground, but the weight is stopped by the support centered on the king pin 11, and Gears a and 25 and gear b
In the meshing between and 22, meshing transmission is performed in a state where the load in the vertical direction can be partially supported.

Furthermore, the space between the upper case 7 and the lower case 8 is sealed by an oil seal 9 to prevent oil leakage and entry of muddy water, etc., and the inner bevel gear a etc. are supported by a thrust bearing body H in the thrust direction. .

In assembling both bevel gears a and b, the bearing C can be fitted into the stepped portion 19 of the boss body B, and the boss body B can be spline-fitted to the boss body A to assemble them as a block.

In this way, the present invention has an upper case T connected to the outer end of the transverse front axle case 6 at the front of the fuselage, and a lower case 8 with the upper part facing inward below the upper case 7. A kink bottle 11 is inserted into a bearing 10 in the upper part of the upper case 7 and is rotatably provided with an oil seal 9 interposed therein.
The lower end is fixed to the lower case 8 by welding W, and the end opposite to the bevel gear a is inserted into the boss body A having a bevel gear a at the end thereof. The boss body B having a bevel gear B is integrally configured to fit on the outer periphery and lock in the rotation direction,
Both bevel gears 2. The bevel gear b located in the middle of b
A bearing C is fitted and supported on the outer periphery of the boss body B, and a thrust bearing body H is interposed between the lower end of the lower bevel gear a and the earth wall portion 8' of the lower case 8. An oil seal 9 is installed between the case 1 and the lower case 8.
The front wheel can be properly supported around the king pin 11 with a structure that can be sealed to prevent oil leakage and intrusion of muddy water, etc., and the structure can be made to ensure reliable steering by welding the king pin 11 and the lower case 8. Kingpin 1
The bevel gears a and b supported by the gears 1 are well supported in the thrust direction by the thrust bearing body H, and the power transmission to the front wheels is made into a compact structure and can be smoothly and functionally carried out. has.

In addition, both separate bevel gears a and b can be placed close together on the same axis, and both bevel gears a and b can be reliably supported by one bearing C, allowing for efficient transmission and assembly in areas with limited space. It also has the advantage of being easy to configure.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view of an agricultural tractor, FIG. 2 is a sectional view of the main part, and FIG. 3 is an enlarged view of a part thereof. 6.°...Front axle case, 1...
・Upper case 8...Lower case, 9...
・・Oil seal 10・・・・Bearing, 11・
...Kingpin, W...-fa contact, a t
b...Bevel gear.

Claims (1)

[Scope of utility model registration request] At the front of the machine, an upper case 1 is connected to the outer end of the horizontal front axle case 6, and an oil seal 9 is installed below the upper case 1 with the upper part of the lower case 8 facing inward. A kink bottle 11, which is interposed and rotatably provided and fitted into a bearing 10 at the upper part of the upper case 7, is inserted downward from the upper case 7 into the lower case 8, and its lower end is welded to the lower case 8. At the upper part of the kink bin 11, a boss body A having a bevel gear a at the end thereof is fitted with a boss body B having a bevel gear b at the end opposite to the bevel gear a, and the boss body B is fitted on the outer periphery of the boss body A having a bevel gear a at the end thereof. A bearing C is fitted and supported on the outer periphery of the boss body B of the bevel gear b located between the bevel gears a and b, and the lower end of the lower bevel gear a and the bottom of the lower case 8 A steering structure for a lower front wheel of an agricultural tractor, characterized in that a thrust bearing body H is interposed between the wall portion 8'.